One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(7,8)(9,10)(11,13)(12,14)(15,16)(17,18)(19,22)(20,28)(21,24)(23,26)(25,27)(29,32)(30,31) involution — undirected(1,2)(3,7)(4,8)(5,6)(9,10)(11,15)(12,14)(13,16)(17,19,21,27)(18,22,24,25)(20,29,30,26)(23,28,32,31)(1,3,5,4)(2,7,6,8)(9,11)(10,13)(12,16)(14,15)(17,20,27,29,21,30,19,26)(18,23,22,31,24,32,25,28)(2,6)(7,8)(11,16)(13,15)(17,19,21,27)(18,22,24,25)(20,26,30,29)(23,31,32,28)(1,4,5,3)(2,8,6,7)(10,14)(13,15)(18,24)(22,25)(23,32)(28,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.